Sheet feeding and gauging mechanism



De- 6, 1949 R. E. NORDQUIST nA.. 2,490,085

SHET FEEDING AND GAUGING MECHANISM Filed Aug. 19, 1947 11 sheets-sheet 1 lNl/ENTORS A ATTORNEYS @51% 51 SNS, m. 55N @N ,(6 w

N @N NIT Dec'. 6, 1949 R. E. J. NoRDQUlsT ETAL 2,490,085

SHEET #Esame Ann GAUGING uEcHANisM Filed Aug. 19, 1947 11 sheets-sheet 2 Dec. 6, 1949 R. 5.1. NoRDQuls-r ErAl. 2,490,085

SHEET PEEDING AND GAUGING ECHANISM Filed Aug. 19, 1947 1i sheets-sheet s ATTORN EYS De@ 6, 1949 R, E. J. NQRpQulsT ETAL 2,490,085

SHEET'FEEDING AND GAUGING ECHNISM Filed Aug. 19,' 1947 11 Sheets-Sheet 4 17.4' JZZ IN ENTORS @4M BYJM-a` ATTORNEYS ll Sheets-Sheet 5 R. E. J. NORDQUIST ETAI- SHEET FEEDING AND GAUGING MECHANISM Filed Aug. 19, 194'7 m- Q i IN. S MS NN* l S, M m o .Q y m O mw i :S151 5. W.: M o* r .0.. ||i||||ll1|| B sw l S. @IN Si d @i Ng a @mm M M. u Ts l JT if M l NQ NQ www m. T \Q NN NNN NQNJ. NN @N1 n. .m lt Vg uw ,IHMFV L NN. o o www Of S. ON ma* E mw .NL .1. do. mm N EN .@.NMNI

D806 1949 R. E. J. NoRDQulsT ETAL 2949,0,085

SHEET FEEDING AND GAUGING MECHANISM ATTORNEYS 6, 1949 R.' E. J. NoRDQulsT EI'AL SHEET FEEDING AND GAUGING MECHAN-ISM Filed Aug. 19, 1947 NN mwN l VE TORS 02E w iBY 42 j VY@ ATTORNEYS Dec. 6, 1949 n. E. J. Nobouls Erm. 2,490,085

SHEET yFEEDING AND QVAUGING HECHANISM /F A @AUG/NG m w Mw m, E 4, 5yd@ o 2 v,m b N M n e A i n Y R. E J NORDQUST ETAL SHEET FEEDINQ AND GAUGING HECHANISII I Dec. 6, 1949 Filed Aug. 19f 1947 De@ 6 '1949 R. E. J. NoRDQulsT Erm.- 2,490,085

SHEET FEEDING AND GUGING IBGHANISM Filed Aug. 19. 1947 4 l1 Sheets-Sheet l1 7 g3 I INVENToRs Bg gfx a f A 7J MMM v- ATTQBNEYS Patented Dec. 6, 1949 SHEET FEEDING AND GAUGING MECHANISM Ronald E. J. Nordquist, Maplewood, and Bruno A. Baumann, Newark, N. J., assignors to American Can Company, New York, N. Y., a corporation of New Jersey Application August 19, 1947, Serial No. 769,365

l 18 Claims.

The present invention relates to a sheet feeding and gauging mechanism in which sheet material is required to be located in an accurate predetermined position for further treatment and has particular reference to gauging devices which are effective against the edges of sheets at selectable gauging points for different sizes of sheets so that different kinds of gauging may be accomplished in the one mechanism. Reference is here made to our copending United States application Serial Number 769,364 filed August 19, 1947, on Sheet feeding and'gauging mechanism.

In the feeding of sheet material such as for example, sheets of tin plate or the like, from which container o1' can parts are made, the sheets are usually gauged by a three point system of gauging so that the sheets may be precisely located each time an operation is performed upon them, whether or not these operations are performed in the same machine or in different machines. In all three point gauging, two of the gauge points are taken along one edge of the sheet while the third gauge point is taken along an adjacent edge of the sheet.

There are two kinds of three point gauging known in can making practice; i. e. A gauging and B gauging. The type of gauging selected depends upon the dimensions of the sheets being fed and the type of operation being performed on the sheets. Usually the sheets are of rectangular form, i. e. where one dimension is greater than the other.

In some cases it may be more practical to feed the sheets through a machine with their long dimension transversely of the machine and their short dimension co-extensive with the path of travel of the sheets. In such a case two back gauge points disposed along the rear edge or long dimension of the sheet would be used with one side gauge point disposed substantially midway between the ends of one of the short side edges of the sheet. This is known as A gauging.

In B gauging, the gauging points are reversed; one back gauge point being used along the rear edge midway between its ends with two side gauge points being used along one of the side edges. This type of gauging is better suited for feeding sheets with their short dimension I extending transversely of the machine and their long dimension coextensive with the path of travel of the sheets.

Heretofore each feeding mechanism was designed and built for one type of gauging and was not convertible to another type. This necessitates a number of different feeding mechanisms for different types of gauging and for different sizes of sheets.

The instant invention contemplates overcoming this difficulty by providing a sheet feeding and gauging mechanism in which both types of gauging may be readily had and in which many different sizes of sheets covering the full range of sheet sizes used in the can making industry may be gauged and fed in the same machine.

An object, therefore, of the instant invention isgthe provision in a sheet feeding and gauging mechanism of gauging devices which are effective against the edges of sheets at selectable gauging points for sheets of different dimensions so that different types of gauging may be used in the same mechanism in accordance with the relative position of the sheets as they pass through the mechanism.

Another object is the provision oi such gauging devices which are readily adapted to high speed operation so that the sheets may be accurately gauged while they are passing through the mechanism in a continuous procession at a high rate of speed.

Another object is the provision of such gauging devices wherein a change from one type of gauging to another may be effected rapidly and with a minimum of eort so that the productiveness of the machine may be greatly enhanced.

Another object is the provision of such gauging devices wherein engagement with the sheet is effected gradually and gently with suicient time provided for smoothly shifting the sheets into properly gauged position without in any way marring or damaging the sheets.

Numerous other objects and advantages of the invention will be apparentas it is better understood from the following description, which, taken in connection with the accompanying drawings, discloses a preferred embodiment thereof.

Fig. 5 is a horizontal section taken substantially along the line 5 5 in Fig. 1. with parts broken away;

Fig. 6 is an enlarged fragmentary top pian view of a portion of the machine shown in Fig. 2, with parts broken away;

Fig. 7 is an enlarged transverse sectional view taken substantially along the broken line 1-1 in Flg. 1, with parts broken away; I

Fig. 8 is an enlarged sectional view taken substantially along the broken line 8-8 in Fig. 6.

with parts broken away;

Fig. 9 is an enlarged sectional view taken substantially along the line 8-9 in Fig. 6, with parts broken away;

Figs. 10, 11 and 12 are enlarged sectional details taken substantially along the respective lines iii-I0 in Fig. 6, II-II in Fi-g. 5 and I2-l2 in Fig. 11, with parts lbroken away;

Figs. 13 and 14 are schematic views illustrating a sheet and the gauging devices in diil'erent positions in accordance with the type of gauging being used.

Fig. 15 is an enlarged schematic plan view of the gauging devices at the gauging station with a sheet in position between the gauging device, parts of the device and the sheet being broken away;

Fig. 16 is a greatly enlarged sectional detail taken substantially along the line iB -IB in Fig. 15, with parts broken away;

Fig. 17 is a transverse sectional view taken substantially along the line i1-I1 in Fig. 1, and showing a sheet in position, with parts broken away;

Figs. 18 and 19 are sectional details taken substantially along the respective lines I 3-18, |9-I9 in Fig. 17, with parts broken away; and

Fig. 20 is an enlarged sectional detail taken substantially along the line 2U-20 in Fig. 19.

When a sheet is to be gauged by the A gauging method the side gauges D are used alone as shown in Fig. 13. When B gauing is to be used both of the side gauges D, E are used as shown in Fig. 14. In either case the gauging elements gradually move inwardly toward the moving sheet and engage gently against its two opposite side edges and thereby shift the sheet into a predetermined side gauged position. This gentle and gradual locating of the sheet is readily effected while the sheet is moving at a high rate of speed.

As the sheets move into a side gauged position the back gauges F (Fig. 2) come into engagement with the rear edge of the moving sheet and bring this edge into a squared-up or gauged position and this completes the full gauging of the sheet. There are three of these back gauges F and they are used selectively in accordance with the type of gauging being used. For A gauging where only one side gauge is used, two of the back gauges are used to complete the three point gauging as shown in Fig. 13. For B gauging where two side gauges are used, only one back gauge is used as shown in Fig. 14.

As a preferred embodiment of the instant invention the drawings illustrate principal parts of a sheet feeding and gauging mechanism for feeding and gauging sheets C (Figs. 13 and 14) of tin plate or the like sheet material and for advancing them into a sheet treating machine such as a printing machine, coating machine. scroll shear, slitter or other machine used for preparing or converting the sheets into container or can parts. I'he mechanism is equipped with two sets of side gauges D, E (Fig. 2) and a set of back gauges 4 F for gauging the sheets C by either the A gauging (Fig. 13) or the B gauging (Fig. 14) methods in accordance with the size and manner of feeding the sheets through the mechanism.

In such a feeding and gauging mechanism the sheets C are advanced along a straight line path of travel betweena pair of the side gauges D and a second adjacent pair of the side gauges E. Each pair of side gauges are disposed at converging angles and include side gauging elements moving in time with the sheet.

Immediately upon location of the sheet in its gauged position, the forward or leading edge of the sheet is gripped between advancing instrumentalities G which take the sheet away from the gauging elements and advance it rapidly into the subsequent operation machine while retaining the sheet in its gauged position. This completes the cycle. of operation of the sheet into and through a gauged position.

In the mechanism the gauging devices D, E, F are movable into various positions for accommodating them to sheets of different dimensions and for this purpose the gauges as well as their associated parts are made adjustable. In cases where the side gauging device D is used alone, as in A gauging, the cooperating side gauge E is removed so that the gauge D may be shifted into a proper gauging position. For this purpose the side gauge E is mounted in such a manner that it may be removed rapidly as a unitary structure.

The sheets C to be gauged and advanced into the subsequent operation machine for further treatment are fe'd into the feeding mechanism at the right as viewed in Fig. 1, from any suitable source of supply. The entering sheets travel in a continuous procession one behind the other in spaced relation on a pair of endless feed chains or conveyors 2l (Figs. 1 and 2) having feed dogs 22 secured thereto at spaced intervals along the chains for propelling engagement with the rear transverse edge of the sheets. The upper 'or feeding runs of these chains operate in longitudinal guide grooves 24 (see also I'igs. 6 and 7) formed in support rails 25 which extendlongitudinally of the feeding mechanism. These support rails are mounted on brackets 26 bolted to a frame 21 which constitutes the main frame of the mechanism.

The sheets C during their travel through the mechanism rest in a horizontal ilat position on the support rails 25 and on a pair of spaced and parallel auxiliary support rails 3| disposed between the support rails 25 near the path of trai-'el of the center portion of the sheets. The auxiliary support rails 3| are carried on support brackets 32 disposed adjacent the ends of the rails and mounted on the main frame 21.

The feed chains 2l operate over two pairs of idler sprockets 35 (Figs. 1, 2 and 6), a pair of auxiliary idler sprockets 36, and a pair of driving sprockets 31. The idler sprockets 35 are mounted on short shafts 38 journaled in bearings 39 formed on and at the ends of the two support rails 25. The auxiliary idler sprockets 35 are mounted in 4spaced relation on short transverse shafts 4I journaled in bearings formed in the main frame 21 (see Fig. 1). The driving sprockets 31 are mounted in spaced relation on a transverse driving sprocket shaft 42 which is journaled in suitable bearings formed in the main frame 21 adjacent the short transverse shafts 4 I.

The driving sprocket shaft 42 is continuously rotated by a drive sprocket 45 (Figs. 4 and 5) which ismounted on one end ofthe shaft. The

drive sprocket is rotated by an endless drive chain 46 which operates over a sprocket 41 carried on one end of a transverse gear shaft 68. This end of the gear shaft is Journaled in a bearing bracket I9 secured to the main frame 21. The opposite end of the shaft is Journaled in a bearing formed in a gear casing 52 bolted to the main frame. Intermediate its ends the shaft is journaled in 'suitable bearings 52 formed in a pair of gear housings 54 which are movable along the shaft for a purpose to be hereinafter explained. t K

In the gear casing 52, thegear shaft 48 carries a bevel gear 56 which meshes with a bevel gear 51 mounted on an auxiliary drive shaft 58 journaled in a bearing 59 formed in the gear casing. The auxiliary drive shaft 58 extends beyond the gear casing 52 and is journaled in a bearing 82 formed in a drive housing 63 located at the exit end of the feeding mechanism.

The auxiliary drive shaft 58 terminates within the drive housing 63 and carriesl on this end of the shaft a bevel gear 65 (Fig. 5). Gear 65 meshes with and is driven by a bevel gear 66 which is mounted on a short cross shaft 61 journaled in bearings 68 formed in the drive housing. The cross shaft carries a pinion 69 which meshes with and is driven by a differential gear 1| (see also Figs. 1, 2 and 17) loosely mounted on but not directly driven by a main driving shaft 12 which extends across the exit end of the feeding mechanism. One end of this driving shaft is journaled in a bearing 13 formed in the drive housing 63. The other end of the driving shaft is journaled in a bearing 14 formed in an auxiliary drive housing 15 located on the opposite side of the feeding mechanism main frame 21.

The differential gear 1| meshes with and is driven by a pinion 11 secured to one end of a roller shaft 18 disposed above and in parallelism with the driving shaft 12. The ends of the roller shaft are journaled in rectangular shaped bearing blocks 19 (Figs. 17 and 19) disposed in slide openings 8| in the drive housing 63 and in the auxiliary drive housing 15. These bearing blocks are movable vertically in the housing openings 8| to permit of a slight vertical movement of the roller shaft 18 relative to the driving shaft 12 for a purpose to be hereinafter explained. For this purpose the vertical edges of the bearing blocks 19 are formed with slide grooves 82 (Figs. 19 and 20) which partially surround and operate against vertical slides 83 formed in the housings adjacent the -slide openings 8|.

In the auxiliary'drive housing 15 the roller shaft 18 carries a gear 85 (Figs. 17 and 19) which meshes with and which is driven by a main driving gear 86 secured to the main driving shaft 12. The main driving shaft is rotated in any suitable manner. The main driving Shaft 'I2 and the roller shaft 18 carry respectively lower and upper cooperating advancing rollers 81, B8 for advancing the gauged sheets into the subsequent operation machine.

Hence through this geartrain the main driving shaft 12 and its gear 86, rotates the gear 85 and the roller shaft 18, and through this roller shaft its gear 11 drives gear 1| and pinion 69 of the short cross shaft 61, the auxiliary drive shaft 58, the transverse gear shaft 48 and thek sprocket shaft 42 in proper synchronism and thereby actuates the feed chains 2| in the proper timed relation for advancing the sheets 1 to be gauged along a straight line path of travel through the feeding mechanism as hereinbefore mentioned.

Side gauging of the moving sheets C while they are propelled by the conveyors 2| toward the exit end of the mechanism is effected by the side gauges D, E as hereinbefore mentioned. There are two of each of these gauges located one on each side of the straight line path of travel of a sheet C through the mechanism and they are of similar construction.

The side gauges D include two sets of endless chain conveyors 90, 9| (Figs. 1, 2, 3 and 6) which are disposed in a horizontal position and at a slight angle to the path of travel of the sheets propelled by the feeding conveyors 2|. These gauging conveyors on both sides of the path of travel of the sheets converege toward the exit end of the feeding mechanism. Each of the conveyors 90, 9| comprises a pair of spaced and parallel, upper and lower chains which operate as a unitary double conveyor structure.

Each set of gauging chains 90, 9| operate over pairs of spaced double sprockets, which constitute idler sprockets 92 and driving sprockets 93 (Fig. 6). The idler sprockets 92 of each set of chains are mounted on a stationary vertical stud 95 (Figs. 1 and 6) which is secured in one end of a movable carriage 96. There are two of these carriages disposed on opposite sides of and adjacent the path of travel of the sheets. The driving sprockets 93 of each set of chains are secured to the upper end of a vertically disposed driven shaft 91 (see Fig. 8) which is mounted on a pair of spaced ball bearings 98 carried in a, retainer 99 formed in the carriages 96.

The side gauges E are similar to the side gauges D and include two sets of endless chain conveyors |0|, |02 (Figs. l, 2 and 6) which are disposed in a horizontal position between the side gauges D and the exit end of the mechanism. Like the gauges D, these gauges E are arranged at a slight angle to the path of travel of the sheets propelled by the feeding conveyors 2|. These gauging conveyors 60|, |02 on both sides of the path of travel of the sheets converge toward the exit end cf the mechanism. Each of the conveyors comprises a pair of spaced and parallel, upper and lower chains which Operate, as a unitary double conveyor structure, over double idler sprockets |03 and double driving spockets ille.

The side gauges E are used only in cooperation with the side gauges D for B gauging of sheets as shown in Fig. 14 and are readily removable from the mechanism when the side gauges D are to be used alone for A gauging of the sheets as shown in Fig. 13. For this purpose each of the driving sprockets it of the gauges E are secured to the upper end of a vertically disposed driven shaft |06 (see Fig. 8) which is mounted on a pair of spaced ball bearings |01 carried in a retainer |08 of a bracket |09 removably bolted to the carriages 96.

The lower end of the bracket retainer |08 is formed with a centralizing hub which fits within a locating bore ||2 formed in the carriage for locating the retainer |08 of the bracket in a predetermined relation to the carriage. A single long bolt ||3 which is readily removable, secures the bracket |09 to the carriage. By removing this bolt the entire bracket and the gauging conveyors E mounted thereon may be rapidly removed from the mechanism. The idler sprockets |03 of these gauges are mounted on stationary vertical studs ||5 (Fig. 6) secured in the brackets |09.

Gauging of the sheets by either of the A or B gauging methods is effected in relation to the advancing rollers 81. 68 respectively mounted on the main driving shaft 12 and the roller shaft 18 disposed at the exit end of the mechanism. Hence when the side gauges E are removed to permit the use of the gauges D alone for A gauging of the sheets as shown in Fig. 13, the gauges D must be shifted closer to the advancing rollers 81, 88 in order to properly gauge the sheets. For this purpose the gauge carriages 86 are secured to slide plates |2| (Figs. 8 and 9) which` rest on and are slidable along a pair of slide rails |22 supported on cross beams |23 of the main frame 21 (see also Fig. 5). The carriages 86 are guided by lugs |25 (Figs. 8 and 9) which extend down from the slide plates |2| and operate in longitudinal grooves |26 formed in the slide rails |22.

Shifting of the carriages is effected manually by long actuating screws |21 (see also Figs. 2 and 5) which are threadedly engaged in the guide lugs |25. There are two of these actuating screws, one for each of the carriages 86, and they extend the full length f the feeding mechanism. Adjacent the feed-in end of the mechanism the screws are held against displacement in the slide rails |22 and are formed with square heads |28 (Fig. 2) for receiving a removable crank for turning the screws.

After a longitudinal adjustment of the carriages 96, they are locked in position against their slide rails |22 to maintain the side gauges D, E or the side gauges D alone which ever is used, in their adjusted location. This is brought about manually by a locking bolt i 3| (Fig. 9) having a T-shaped head |32 which operates in a T slot |33 formed in the slide rails |22. These T slots are disposed adjacent and parallel with the slide grooves |26 in the rails.

The locking bolts 3| extend up through the slide plates |2| and through a sleeve |34, the upper end of which is rotatably carried in a bearing v|35 formed in the carriages 86. The upper end of the bolt extends through a lock washer |36. Above the washer the bolt is threaded and carries an adjusting gear nut |31 which is rotatably movable against the washer for drawing the bolt head |32 into a locking position within the T slot |33. It is this action of the bolts that lock the carriages in their adjusted positions.

Rotation ofv each of the adjusting gear nuts |31 preferably is effected individually by gears |4| which are formed on vertical shafts |42 carried in bearings |43 formed in the carriages and bearings |44 in plates |45 secured to the carriages. The upper ends of the shafts are provided with square heads for the manual application of a crank or wrench to turn the shafts. In this manner the part of the locking device which is to be turned to lock the carriage in position, may be located in an accessible position in the mechanism. In the instant case the locking device is located between the side gauges D, E (see Figs. 2 and 6).

The gauge carriages 96 are also movable transversely of the feeding mechanism to locate the gauging devices D, E for the transverse dimension of sheets of dierent sizes. For this purpose the slide rails |22 are slideably supported on pads |48 (Figs. 5 and 7) on the cross beams |23 of the main frame 21. The slide rails are formed with transverse depending tongues |I (Fig. 9) which operate in slide grooves |52 in the pads.

Adjacent the pads |48 the slide rails |22 have depending lugs |53 (Figs. 7 and 9) which surround and which are threadedly connected with transverse adjusting screws |64 (see also Figs.

2 and 5). There are two of these adjusting screws for each slide rail and they are located near the ends of the rails. At the exit end of the mechanism the' adjusting screws are carried in bearing blocks |55 formed on the pads |48. The outer ends of these two screws carry bevel gears |56 which mesh with bevel gears |51 mounted on a pair of longitudinal actuating shafts |58 carried in bearings |59 extending out from the side members of the main frame 21.

Adjacent the feed-in end of the mechanism the actuating shafts |58 carry bevel gears |6| which mesh with bevel gears |62 mounted on the adjusting screws |54 at this end of the mechanism. These screws are carried in suitable bearings formed on the main frame 21. The outer ends of these two screws extend beyond the frame and are formed with square heads |63 for the reception of a crank or a wrench for manually turning the screws.

Thus by turning one of the screws |54, the actuating shaft |58 and the other screw |54 connected therewith are turned in unison and thus the slide rail |22 and side gauges D, E carried thereon are shifted to a desired transverse position. The two slide rails and parts carried there- 'on are adjusted separately and independently.

All of the chains 80, 9|, |0|, |02 of the angularly disposed side gauging devices D, E are actuated continuously and in unison in whatever position they may be for sheet size. The chains on opposite sides of the path of travel of the sheets are operated in opposite directions so that the chain-runs adjacent vthe moving sheets, move in the direction of travel of the sheets and at the same speed as the sheets.

This continuous and synchronous actuation of the gauging chains 90, 9|, |0|, |02 is brought about by a train of gears which connects the driving sprocket shafts 91, |06 (Fig. 8) of the gauging devices. For this purpose the lower end of the driving sprocket shaft |06 of the gauging device E carries a spur gear |65 which meshes with an idler gear |6 (see also Fig. 9) carried on a ball bearing |61 mounted on the carriage lock bolt sleeve |34. The gear |65 is designed to pass up through the .bore ||2 in the carriage 96 when the gauging device E is removed and thereby in no way interfere with the removal of the device.

The idler gear |66 meshes with and is driven by a spur gear |68 mounted on the lower end of the driving sprocket shaft 91 of the gauging device D. The sprocket shaft 91 is driven by a helical gear |68 which is carried on the sprocket shaft and which is driven by a meshing helical gear |1|.

There are two of these gear trains, one for each carriage 96 and the side gauges D, E carried thereon and they are separately driven in unison by a pair of longitudinal driving shafts |14 (Fig. 5) on which the helical gears |1| of the two gear trains are mounted. The helical gears 1| are disposed between a pair of bearings |15 formed on the carriages 96 and are slidably secured to the shafts by a key which is movable along the shaft in a` groove |16 (see Fig. 9) formed in the shaft. Thus the helical gears shift with the carriages 96 when changing gauges for A or B gauging, while maintaining a driving connection with the longitudinal drive shafts |14.

The longitudinal drive shafts |14 intermediate their ends are journaled in the carriage bearings |15. At the exit end of the mechanism the shafts are free and unsupported. At the feed-in end of the mechanism the shafts are journaled in suitable spaced bearings |18 (Fig. 5) formed in the gear housing 54 (see also Fig. 4) which surround the transverse gear shaft 48. Within the gear housings, the longitudinal shafts |14 carry helical gears |19 which mesh with and are driven by helical gears |8| keyed to the gear shaft 48.

The gear housings 54 are bolted to the carriage slide rails |22 and move with these rails for adjustment of the-gauges D, Efor sheets of diilerent transverse dimension. The helical. gears |8| within the housings are slidable along their gear shaft 48. In this manner a driving connection for the side gauges D, E is always maintained with the gear shaft 48 and through this shaft are actuated in the proper timed relation with the travel of a sheet C to be gauged as hereinbefore mentioned.

The chains of each of the conveyors 99, 9|, |0|, |02 of the gauging devices D, E intermediate their idler and driving sprockets are maintained in their properly spaced horizontal planes against sagging by spaced and parallel plates |85 (Figs. 6, 7 and 8) the outer longitudinal edges oi which engage against and support the chains as shown in Fig. i6. There is one of these plates for each chain. These plates are held in separated relation by spacer sleeves |86 interposed between them. The plates and the sleeves are held in position by long bolts |81 which extend through these parts and are threadedly secured in bosses |88 formed on the carriages 96.

Gauging of a sheet C is effected while the sheet, propelled by the feeding conveyors 2| passes between the oppositelv and angularly disposed chains 90, 9|, Mii, |02 of the gauging devices D, E as hereinbefore mentioned. This gauging is brought about by cooperating pairs of stop rollers or elements |9| (Figs. 6, 7, 13, 14 and 15) and tension rollers or elements |92 carried on the gauging conveyors. The stop rollers |9| are xed gauging elements and are engageable against the side edges of a sheet C at predetermined gauging points for side gauging the sheet. There are two of these stop elements one for each of the side gauging devices D, E and they are both on the same side of the mechanism. The elements are disposed between and travel with the upper and lower chains of the conveyors 90, and are mounted on vertical pins |93 (Fig. 15) the-ends of which are secured in the chains of each device.

The tension rollers or elements |92 are movable and yieldable gauging elements and are engageable against the opposing side edges of a sheet C for shifting and maintaining the sheet in engagement with the stop elements 89|. There are two tension rollers |92 one for each of the side gauging devices D, E and they are both on the same side of the mechanism and opposite the stop rollers |9I. The tension rollers are disposed between and travel with the upper and lower chains of the conveyors 9|, |02 and are mounted on a vertical pin |95 (Figs. 15 and 16) the ends of which are secured in a pair of spaced and parallel swing arms |95 mounted on pivot pins |91 carried in the upper and lower chains of the gauging conveyors 9|, |02.

The tension rollers |92 are maintained under spring pressure to provide for their yielding action. For this purpose one end of a wire spring |98 engages against the upper end of the` roller pin |95. The opposite end of the spring curves around the pivot end of one of the swing arms |96 as best shown in Fig. 16 and is secured to the inner end of the arm pivot pin |91. Thus the springs keep the tension rollers |92 normally in 10 an outward or extended position relative to the gauging conveyors. Lugs |99 formed on the inner edges of the swing arms |96 adjacent the tension rollers |92 engage against the inner edges of the chains and limit the outward travel of the rollers for keeping them within a predetermined range.

The two stop rollers |9| and the two tension rollers |92 are mounted on their respective gaug ing conveyors 90, |0| and 9|, |92 in transverse opposing alignment and travel with their conveyors in unison around the sprockets 92, 93 and |02, |04 and along the longitudinal inner and outer runs of the chains in this aligned relation. The two stop rollers |9| and also the two tension rollers |92 are also spaced apart longitudinally a predetermined distance at all times relative to each other.

In operation, as for B gauging when both gauging devices are used, the stop roller |9| and the tension roller |92 of the gauging devices D swing around their idler sprockets 92 simultaneously and toward each other with the movement of these'rollers oi' the gauging devices E around their driving sprockets |09. This movement of the rollers around the sprockets brings them into the inner runs of the chains and thus all of the gauging rollers move into a position adjacent but not touching the side edges of a sheet C moving for= ward on the feed conveyors 2|.

For B gauging this action is timed so that the gauging rollers are located near the ends oi the sheet. For A gauging where only the gauging device D is used, this action is timed so that the gauging rollers oi this device are located intermediate the ends of the sheet in a substantially midway relation. 'The sheet and the rollers travei forward together at the same speed and with the sheet interposed between the rollers as the latter move along the inner runs of their conveyor` chains.

As the sheet C continues to advance along its straight line path of travel, the gauging rollers are moving inwardly at an angle to the sheet and thus gradually approach the sheet and gently engage against its opposite side edges. lf one set or the other of the rollers on the same side of the sheet engages a sheet edge before the other, the sheet will be shifted laterally by the gauging set of rollers as the sheet moves forward. The purpose of such lateral shifting of the sheet is to bring it into engagement with the stop rollers |9| and to hold it in this position under the pressure of the springs |98 of the tension rollers |92.

Thus when the tension rollers |92 engage the adjacent edge of a moving sheet C and push the sheet laterally against the stop rollers i9| on the opposite side of the mechanism, the sheet is in a gauged position relative to its side edges and the tension rollers cannot move the sheet any iurther. Hence during the remainder of the ltravel of the tension rollers along the angularly disposed inner runs of the gauging conveyors, the rollers move along a straight line path of travel with the sheet and the difference between these two paths of travel is taken up by the tension springs |90.

As the moving sheet approaches this side gauged position, the side edge portions of the sheet are restrained from displacement out of their horizontal position. This keeps the sheet in a nat condition. For this purpose the sheet edge portions pass between a pair of upper and lower vertical retaining members 20|, 202 (Figs. 6 and 7) having a clearance space between them slightly greater than the thickness of the sheets il passing between them. There are four sets of these retaining members located one adJacent each gauging conveyor of the gauging devices D, E,

The upper retaining members 28| are secured to overhanging brackets 2III3- which are bolted to the upper guide plates |85 of the gauging chains 9U, 9|, IDI, |92. The lower retaining members 282 of the gauging devices D are bolted to bosses 284 formed on the carriages 99. These members for the gauging devices E are secured to suitable bosses formed on the brackets |09 so that the members will be removed with the gauging devices when they are lifted oii' for A gauging of the sheets.

Side gauging cf a sheetis completed just before and is maintained while the gauging rollers |9i, |92 pass into a gauging station indicated by a dot and dash line HH in Fig. 6, which is a line region extending transversely of the mechanism along a line connecting the centers of the driving sprockets 93 of the gauging devices D. This gauging station is related to the distance between it and the advancing rolls 81, 88 at the exit end of the mechanism and varies with the type oi' gauging used and the longitudinal dimension of the sheets to be gauged. The position of the gauging devices D determines the location of the gauging station H.

As a side gauged sheet approaches this gauging station H it is gauged along its rear edge to bring the sheet into a squared and fully gauged position. Gauging of the sheet along its rear edge is effected by the back gauges F hereinbefore mentioned. There are three of these back gauges and they comprise contact fingers 2| l (Figs. 6 and 10) which are adjustably mountedon arms 2|2 secured to a continuously rotating back gauge shaft 2|3 which extends across the feeding mechanism. Manually operable adjusting screws 2| l secured in the arms engage against the fingers for adJusting them into a predetermined position.

For B gauging a sheet, where only one back gauge is required, the middle back gauge is used while the contact ngers 2|I of the two outer gauges are adjusted by the screws 2H into a position where they clear the sheet edge and therefore are out of engagement with this edge. For A gauging, the two outer contact fingers are adjusted into sheet gauging position and the middle nger is moved back out of the way. These ad justments for different types of gauging may be eilected rapidly.

The back gauge shaft 2|3 is rotated continuously in time with the feeding conveyors 2|. For this purpose the ends of the shaft are Journaled in bearings 2I6 (Figs. 2 and 5) formed in blocks 2I1 supported on the main frame 21. One of the blocks is formed integrally with a gear casing 2 I8 (see also Fig. 7) which surrounds the auxiliary drive shaft 58 disposed adjacent one side of the mechanism. Within the gear casing the back gauge shaft 2|3 carries a bevel gear 22| which meshes with and is driven by a bevel pinion 222 (Fig. 5) feathered onto but slideable along the auxiliaryI drive shaft I8.

Through this gear connection with the auxiliary drive shaft 58, the back gauge shaft 2|3 rotates the back gauges F through a rotary or circular path of travel below the sheets advanced by the feeding conveyors 2| and brings the back gauge fingers 2|| up behind a side gauged sheet at the proper time for engagement against the rear edge of the sheet.

As the back gauge finger or fingers 2| I contact the sheet edge, they advance the sheet forward and away from the feed dogs 22 on the feeding conveyors 2| and shift the sheet into a fully gauged position as shown in Fig. 6. This occurs just as the stop roller |9| and the cooperating tension roller |92 of the gauging device D come into alignment with the gauging station H. At this station the stop roller or rollers |9| engage against and are backed-up by backing hubs 225 (Fig. 15) formed integrally with and between the upper and lower adjacent driving sprockets 93 and idler sprockets |88.

The back gauge shaft 2|3 is movable longitudinally of the mechanism for properly positioning the back gauges F for different types of gauging and for sheets having different longitudinal dimensions. This is brought about by manual shifting of the blocks 2|1. For this purpose the blocks are slidably mounted on a pair of longitudinal rails 228 (Figs. 2, 5, 11, and 12) formed on the main frame 21 along its sides.

The blocks 2|1 are guided by a rack bar 229 which is secured to the top of the rails 228. This bar extends the full length of the rails and projects up into a slideway 23| formed in the bottom of the blocks. The two blocks, one on each side of the mechanism are connected by a transverse rod 233 which carries pinions 234 (Figs. 11 and 12) meshing with the rack bar 229. These pinions are carried in bearings 235 formed in the blocks. One end of the rod 233 extends beyond its block 2|1 and is formed with a square head l23|i for the reception of a crank or wrench for turning the rod.

`Hence by turning the transverse rod 233, the pinions 234 rotate on and travel along the rack bar 229. This action propels the two back gauge shaft blocks 2|1 in unison along their slide rails 228 and thus permits of shifting the back gauges F into a desired position relative to the side gauging device D.

After an adjustment of the back gauge shaft blocks 2|1 they are locked in position against displacement by locking bolts 231 (Fig. l1) 1ocated in the blocks. There are two of these bolts for each block. The lower ends of the bolts are formed with T-shaped heads 238 (Fig. 11) which operate in T slots 239 (Figs. 5 and 12) formed in and longitudinally of the rails 228 and the rack bars 229 so that the bolts will travel with the blocks. The upper ends of the bolts extend above the blocks and are equipped with nuts. By tightening these nuts the bolts may be drawn tight in the T slots 238 and thereby lock the blocks against movement. The bolts are loosened when adjustment of the blocks becomes necessary.

When a sheet C is in a fully gauged position as shown in Fig. 2, its forward edge portion extends beyond the feeding mechanism and is disposed between the advancing rolls 81,188 which are momentarily separated or open at this time. As soon as the sheet reaches this fully gauged position, the upper advancing rolls 81 move down against the sheet, clamping it tightly against the lower advancing rolls 88 and thus together rapidly pull the gauged sheet out of the feeding mechanism and advance it into or toward the subsequent operation machine as hereinbefore mentioned.

This clamping of the gauged sheet between the advancing rolls 81, 88 arrests any further action of the gauging devices on the sheet and thereby prevents the gauging devices from inadvertently shifting the sheet out of its gauged 13 position after it has once been gauged and ready for further advancement.

Movement of the upper advancing rolls 81 into an open position to permit the entrance of the sheet between the rolls and to close them against the sheet and the lower rolls,` to advance the sheet, is effected in time with the movement of the sheet and by differential devices located in the drive housings 63, 15 (Fig. 17). These differentlal devices include the differential gear 1l and the pinion 11 located in the drive housing 63 and a similar differential gear 24'5 (Figs. 1'1 and 19) and pinion 246 located in the drive housing 15. The differential -gears 1I, 245 are loose on the main drive shaft 12. The pinions 11, 246 are keyed to the upper roll shaft 18. Each of the pinions 11, 246 are formed integrally with cam rollers 241 (see also Fig. 18) which rotate on edge cams 248 formed integrally with the gears 1I, 245.

Hence as the main shaft 12 rotates the roll shaft 18, through the connecting gears 85, 86, and pinions 11, 246 carried on the roll shaft rotate the differential gears 1 I, 245 loosely mounted on the drive shaft and thereby rotate the cams 248 at `a speed slower than that of either shaft. The speed of rotation of the cams is calculated to provide one rotation of the cams for each sheet C passing through the gauging station H.

Thus once for each sheet, the cams 248 raise the cam rollers 241 and the roll shaft 18 connected therewith to permit the forward edge portion of a gauged sheet to enter between the rolls 81, 88 for clamping and advancing the gauged sheet as hereinbefore mentioned. It is for this reason that the roll shaft the slide bearings 19.

The separation of the rolls 81, 88 is just sufflcient to permit a sheet to enter between them and is not great enough to eiect an unmeshing of the gears carried on the roll shaft 18 and the main drive shaft 12. Support extensions 25| (Figs. 2 and 6) of the feeding conveyor support rails 25 project into the spaces adjacent the advancing rolls for supporting the sheets as they enter between the rolls. This advancement of the gauged sheet C into the subsequent operation machine completes the cycle of operations on the sheet.

It is thought that the invention and many of its attendant advantages will be understood from the foregoing description, and it will be apparent that various changes may be made in the form, construction and arrangement of the parts without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the form hereinbefore described being merely a preferred embodiment thereof.

We claim:

1. In a sheet feeding and gauging mechanism, the combination of feeding means engageable with a rear edge of a sheet for advancing it along a path of travel, a plurality of back gauges operable in the path of travel of the sheet for gauging contact with the rear edge of the sheet, a plurality of side gauges operable at one side of the path of travel of the sheet for gauging contact with lthe adjacent side edge of the sheet, and means for making some of said back gauges or some of said side gauges inoperative so that at least two of one kind of said gauges make contact with one of said edges of the sheet and one of the other kind of said gauges makes contact with the other of said edges of the sheet for locating the sheet in a predetermined gauged position. f

is mounted in i4 2. In a sheet feeding and gauging mechanism, the combination of feeding means engageable with a rear edge of a sheet for advancing it along a path of travel. a plurality of back gauges oper-` able in the path of travel of the sheet for gauging contact with the rear edge of the sheet, two gauge conveyors operable in unison at one side of the path of travel of the sheet, a side gauge carried on each of said conveyors for gauging contact with the adjacent side edge of the sheet, and means for setting said back gauges and said gauge conveyors at the desired distances from said sheet so that two of one kind of said gauges make contact with one of said edges of the sheet and one of the other kind of said gauges makes contact with the other of said edges of the sheet for locating the sheet in a predetermined gauged position.

3. In a sheet feeding and gauging mechanism, the combination of feeding means engageable with a rear edge of a sheet for advancing it along a path of travel, three back gauges operable in the-path of travel of the sheet for gauging contact vwith the rear edge of the sheet, a pair of gauge conveyors operable in unison at one side of the path of travel of the sheet and each conveyor operable at an angle thereto, a side gauge carried on each of said conveyors for gauging contact with a side edge of the sheet, and means for setting said back gauges and said gauge conveyors in one of two selected positions so that the two side gauges make contact with. the side edge of the sheet and one of the back gauges makes contact with the back edge of the sheet or so that one side gauge and two back gauges contact the sheet side and back edges for locating the sheet in the desired gauged position.

4. In a sheet feeding and gauging mechanism, the combination of feeding means engageable with a rear edge of a sheet for advancing it along a path of travel, a plurality of back gauges operablein the path of travel of the sheet for gauging contact with the rear edge of the sheet, a plurality of pairs of gauge conveyors operable in unison and disposed adjacent and on opposite sides of the path of travel of the sheet, stop elements carried on each of the conveyors located on one side of the path of travel of the sheet for gauging contact with the adjacent side edge of the sheet, cooperating tension gauge elements carried on each of the conveyors located on the opposing side of the path of travel of the sheet for gauging contact with the adjacent side edge of the sheet, and means for setting said back gauges and cooperating pairs of gauge conveyors on each side of the path of travel of the sheet so that for one setting the gauges effective against a sheet for locating it in a gauged position included two stop elements, two cooperating tension gauges and one back gauge, and for another setting include one stop element, one cooperating tension gauge and two back gauges.

5. In a sheet feeding and gauging mechanism, the combination of feeding means engageable with a rear edge of a sheet for advancing it along a path of travel, a plurality of back gauges operable in the path of travel of the sheet for gauging contact with the rear edge of the sheet, a plurality of pairs of gauge conveyors operable in unison and disposed adjacent and on opposite sides of the path of travel of the sheet and at an angle thereto and movable in time with the travel of the sheet, stop elements carried on each of the conveyors located on one side of the path of travel of the sheet for gauging contact with the adjacentside edge of the sheet, cooperating tension gauge elements canied on each of the conveyors located on the opposing side of the path of travel of the sheet for gauging contact with the adjacent side edge of the sheet for gradually shifting the sheet laterally into engagement with. said stop elements, and means for setting said back gauges and cooperating pairs of gauge conveyors on each side of the path of travel of the sheet so that for one sheet the gauges effective thereagainst for locating the sheet in a gauged position include two stop elements, two cooperating side gauges and one back gauge, and for another sheet include one stop element, one cooperating side gauge and two back gauges.

6. In a sheet feeding and gauging mechanism, the combination of feeding means engageable with a rear edge of a sheet for advancing it along a path of travel, a plurality of back gauges operable in the path of travel of the sheet and selectively movable for gauging contact with the rear edge of the sheet, a pair of side stop elements disposed adjacent one side of the path of travel of the sheet, a pair of side tension gauge elements disposed adjacent the opposite side of the path of travel of the sheet and movable therealong in time with the travel of the sheet for engaging the sheet at predetermined points and gradually shifting the sheet laterally into engagement with said stop elements, and means for setting said back gauge elements and said side gauge elements so that at least two of one kind Vof said gauge elements make contact with one of said edges of the sheet and one of the other kind of said gauge elements makes contact with the other of said edges of the sheet for differently gauging and locating sheets of different dimensions in predetermined gauged positions.

7. In a sheet feeding and gauging mechanism, the combination of feeding means engageable with' a rear edge of a sheet for advancing it along a path of travel, a plurality of back gauges operable 'in the path of travel of the sheet and selectively movable for gauging contact with the rear edge ofthe sheet, a pair of side stop elements disposed adjacent one side of the path of travel of the sheet, a pair of side tension gauge elements disposed adjacent the opposite side of the path of travel of the sheet and movable at an angle thereto in time with the travel of the sheet for engaging the sheet at predetermined points and gradually shifting the sheet laterally into engagement with said stop elements, and means for setting said back gauge elements and said side gauge elements so that at least two of one kind of said gauge elements make contact with one of said edges of the sheet and one of the other kind of said gauge elements makes contact with the other of said edges of the sheet for differently gauging and locating sheets of different dimensions in predetermined gauged positions.

8. In a sheet feeding and gauging mechanism, the combination of feeding means engageable with a rear edge of a sheet for advancing it along a path of travel, a plurality of back gauges operable in the path of travel of the sheet and selectively movable for gauging contact with the rear edge of the sheet, a pair of side tension elements disposed adjacent one side of the path of travel of the sheet, a pair of side stop elements disposed adjacent the opposite side of the path of travel of the sheet and movable therealong in time with the travel of the sheet for engaging the sheet at predetermined points and gradually shifting the sheet laterally into engagement with said tension elements, and means for setting said back stop elements and said side gauge elements so that at least two of one kind oi said gauge elements make contact with one of saidvedges oi' the sheet and one of the other kind of said gauge elements makes contact with the other of said edges of the sheet for differently gauging and locating sheets of diferent dimensions in predetermined gauged posiions.

9. In a sheet feeding and gauging mechanism, the combination of feeding means engageable with a rear edge of a sheet for advancing it along a path oi' travel, a plurality of back gauges operable in the path of travel of the sheet and selectively movable for gauging contact with the rear edge of the sheet, a pair of side tension elements disposed adjacent one side oi' the path of travel of the sheet, a pair of side stop elements disposed adjacent the opposite side of the path of travel of the sheet and movable at an angle thereto in time with the travel of the sheet for engaging the sheet at predetermined points and gradually shifting the sheet laterally into engagement with said tension elements, and means for setting said back gauge elements and said side stop elements so that at least two of one kind of said gauge elements make contact with one of said edges of the sheet and one of the other kind of said gauge elements makes'contact with the other of said edges of the sheet for dierently gauging and locating sheets oi different dimensions in predetermined gauged positions.

10. In a sheet feeding and gauging mechanism, the combination of feeding means engageable with a rear edge of a sheet for advancing it along a path of travel, a plurality of back gauges operable in the path of travel of the sheet and selectively movable for gauging contact with the rear edge oi' the sheet, a pair of side stop elements movable along one side of the path of travel of the sheet, a pair of side tension gauge elements disposed adjacent the opposite side of the path of travel of the sheet and movable at an angle thereto in time with the travel of the sheet for engaging the sheet at predetermined points and gradually shifting the sheet laterally into engagement with said stop elements and means for setting said back gauge elements and said side gauge elements so that at least two of one kind of said gauge elements make contact with one of said edges of the sheet and one of the other kind of said gauge elements makes contact with the other of said edges of the sheet for differently gauging and locating sheets of different dimensions in predetermined gauged positions.

11. In a sheet feeding and gauging mechanism', the combination of feeding means engageable with a rear edge of a sheet for advancing it along a path of travel, a plurality of back gauges operable in the path of travel of the sheet and selectively movable for gauging contact with the rear edge of the sheet, a pair of side tension elements movable along one side of the path of travel of the sheet, a pair of side stop elements disposed adjacent the opposite side of the path of travel of the sheet and movable at an angle thereto in time with the travel of the sheet for engaging the sheet at predetermined points and gradually shifting the sheet laterally into engagement with said tension elements, and means for setting said back gauge elements and said side stop elements so that at least two of one kind of said gauge elements make contact with one of said edges of the 17 sheet and one of the other kind of said gauge elements makes contact with the other of said edges of the sheet for diierently gauging and locating sheets of diierent dimensions in predetermined gauged positions.

12. In a sheet feeding and gauging mechanism, the combination of feeding means engageable with a rear edge of a sheet `for advancing it along a path of travel, a plurality of back gauges operable in the path of travel of the sheet and selectively movable for gauging contact with the rear edge of the sheet, a pair of side stop elements disposed adjacent one side of the path of travel of the sheet and selectively movable for gauging contact with the adjacent side of the sheet, backing up means operable on said side stop elements during their gauging operation for retaining them in an unvarying path, a pair of side tension gauge elements disposed adjacent the opposite side of the path of travel of the sheet and movable therealong in time with the travel of the sheet for engaging the sheet at predetermined points and gradually shifting the sheet laterally into engagement with said stop elements, and means for setting said back gauge elements and said side gauge elements so that at least two of one kind of said gauge elements make contact with one of said edges of the sheet and one of the other kind of said gauge elements makes contact with the other of said edges of the sheet for differently gauging and locating sheets of different dimensions in predetermined gauged positions.

13. In asheet feeding and gauging mechanism, the combination of feeding means engageable with a rear edge of a sheet for advancing it along a path of travel, a plurality of back gauges operable in the path of travel of the sheet and selectively movable for gauging contact with the rear edge of the sheet, a pair of side stop elements movable along one side of the path of travel of the sheet and through a gauging station in time with the travel of the sheet for gauging contact with the adjacent side of the sheet, backing-up means at said gauging station and operable on said side stop elements during their gauging operation for retaining them in an unvarying path, a pair of side tension gauge elements disposed adjacent the opposite side of the path of travel of the sheet and movable at an angle thereto in time with the travel of the sheet for engaging the sheet at predetermined points and gradually shifting the sheet laterally into engagement with said stop elements to bring it into gauged position at said gauging station, and means for setting said back gauge elements and said side gauge elements so that at least two of one kind of said gauge elements make contact with one of said edges of the lsheet and one of the other kind of said gauge elements makes contact with the other of said edges of the sheet for differently gauging and locating sheets of different dimensions in predetermined gauged positions at said gauging station.

14. In a sheet feeding and gauging mechanism, the combination oi feeding means engageable with a rear edge of a sheet for advancing it along a path of travel, a plurality of back gauges operable in the path of travel of the sheet and selectively movable for gauging contact with the rear edge of the sheet, a plurality of conveyor units comprising one pair disposed on each side of the vpath of travel of the sheet and operable in time with the travel of the sheet, a side stop element carried on each of the conveyors disposed on one side of the path of travel of the sheet for cooperation with said back gauges in gauging a sheet, a

side tension element carried on each of the conveyors disposed on the opposite side of the path of travel of the sheet for shifting the sheetinto engagement with said stop elements, a movable mounting for two oppositely disposed units of said conveyors, an auxiliary mounting movable with said movable mounting for the other two oppositely disposed units of said conveyors, said auxiliary mounting and the conveyor units therefor being usable with said movable mounting and the conveyor units 'therefor for one kind of sheet gauging and not being usable with said movable mounting and the conveyor units therefor for another kind of sheet gauging, and means for shifting said movable mounting into a desired gauging position for the proper kind of gauging'.

l5. In a sheet feeding and gauging mechanism, the combination of feeding means engageable with a rear. edge of a sheet for advancing it along a path of travel, a plurality of back gauges operable in the path of travel of the sheet and selectively movable for gauging contact with the rear edge of the sheet, a plurality of conveyor units comprising one pair disposed on each side of the path of travel of the sheet and operable in time with the travel of the sheet, a side storp element carried on each of the conveyors disposed on one side of the path of travel of the sheet for cooperation with said back gauges in gauging a sheet, a side tension element carried on each of the conveyors disposed on the opposite side of the path of travel of the sheet for shifting the sheet into engagement with said stop elements, a movable mounting for two oppositely disposed units of said conveyors, an auxiliary mounting movable with said movable mounting for the other two oppositely disposed units of said cc-nveyors, said auxiliary mounting andthe conveyor units therefor being usable with said movable mounting and the conveyor units therefor for one kind of sheet gauging and not being usable with said movable mounting and the conveyor units therefor for another kind of sheet gauging, means for shifting said movable mounting into a desired gauging position for the different kinds of gauging, and

separate means for shifting said back gauges relative to said movable mounting for the different kinds of gauging.

16. In a sheet feeding and gauging mechanism, the combination of feeding means engageable with a rear edge of a sheet for advancing it along a path of travel, a plurality of rotatable back gauges operable in the path of travel of the sheet and selectively movable for gauging contact with the rear edge of the sheet, a movable submounting for said back gauges,'means for shifting said submounting longitudinally of the mechanism for locating said back gauges in a selected position in accordance with Vthe dimensions of the sheets to be gauged for gauging sheets of diierent sizes, means for shifting each of said back gauges independently relative to each other for using said gauges selectively in accordance with the type of gauging to be used, a pair of side stop elements disposed adjacent one side of the path of travel of the sheet` a pair of side tension gauge elements disposed adjacent the opposite side of the path of travel of the sheet and movable therealong in time with the travel of the sheet for engaging the sheet at predetermined points and gradually shifting the sheet laterally into engagement with said stop elements, and means for arranging said side gauge elements so that two of said side gauge elements can be used with one of said back gauges for one kind of gauging and one of said side gauge 

